Jessica Simpson is happy to “make money off” the chatter surrounding her fluctuating weight. The 42-year-old star acknowledges that her weight has been the subject of speculation for years, and it was actually one of the reasons she decided to launch her own fashion line, The Jessica Simpson Collection. The singer – who has Birdie, three, Ace, nine, and Maxwell, ten, with her husband Eric Johnson – told ‘Extra’: “I decided, ‘Okay, everybody is going to talk about my weight all the time, I might as well make money off of it and turn it into a business of selling clothes and acceptance.'” By con…